diff options
Diffstat (limited to 'drivers/media/video/saa7134/saa7134-i2c.c')
| -rw-r--r-- | drivers/media/video/saa7134/saa7134-i2c.c | 435 |
1 files changed, 0 insertions, 435 deletions
diff --git a/drivers/media/video/saa7134/saa7134-i2c.c b/drivers/media/video/saa7134/saa7134-i2c.c deleted file mode 100644 index a176ec3285e0..000000000000 --- a/drivers/media/video/saa7134/saa7134-i2c.c +++ /dev/null @@ -1,435 +0,0 @@ -/* - * - * device driver for philips saa7134 based TV cards - * i2c interface support - * - * (c) 2001,02 Gerd Knorr <kraxel@bytesex.org> [SuSE Labs] - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License as published by - * the Free Software Foundation; either version 2 of the License, or - * (at your option) any later version. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. - * - * You should have received a copy of the GNU General Public License - * along with this program; if not, write to the Free Software - * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. - */ - -#include <linux/init.h> -#include <linux/list.h> -#include <linux/module.h> -#include <linux/kernel.h> -#include <linux/delay.h> - -#include "saa7134-reg.h" -#include "saa7134.h" -#include <media/v4l2-common.h> - -/* ----------------------------------------------------------- */ - -static unsigned int i2c_debug; -module_param(i2c_debug, int, 0644); -MODULE_PARM_DESC(i2c_debug,"enable debug messages [i2c]"); - -static unsigned int i2c_scan; -module_param(i2c_scan, int, 0444); -MODULE_PARM_DESC(i2c_scan,"scan i2c bus at insmod time"); - -#define d1printk if (1 == i2c_debug) printk -#define d2printk if (2 == i2c_debug) printk - -#define I2C_WAIT_DELAY 32 -#define I2C_WAIT_RETRY 16 - -/* ----------------------------------------------------------- */ - -static char *str_i2c_status[] = { - "IDLE", "DONE_STOP", "BUSY", "TO_SCL", "TO_ARB", "DONE_WRITE", - "DONE_READ", "DONE_WRITE_TO", "DONE_READ_TO", "NO_DEVICE", - "NO_ACKN", "BUS_ERR", "ARB_LOST", "SEQ_ERR", "ST_ERR", "SW_ERR" -}; - -enum i2c_status { - IDLE = 0, // no I2C command pending - DONE_STOP = 1, // I2C command done and STOP executed - BUSY = 2, // executing I2C command - TO_SCL = 3, // executing I2C command, time out on clock stretching - TO_ARB = 4, // time out on arbitration trial, still trying - DONE_WRITE = 5, // I2C command done and awaiting next write command - DONE_READ = 6, // I2C command done and awaiting next read command - DONE_WRITE_TO = 7, // see 5, and time out on status echo - DONE_READ_TO = 8, // see 6, and time out on status echo - NO_DEVICE = 9, // no acknowledge on device slave address - NO_ACKN = 10, // no acknowledge after data byte transfer - BUS_ERR = 11, // bus error - ARB_LOST = 12, // arbitration lost during transfer - SEQ_ERR = 13, // erroneous programming sequence - ST_ERR = 14, // wrong status echoing - SW_ERR = 15 // software error -}; - -static char *str_i2c_attr[] = { - "NOP", "STOP", "CONTINUE", "START" -}; - -enum i2c_attr { - NOP = 0, // no operation on I2C bus - STOP = 1, // stop condition, no associated byte transfer - CONTINUE = 2, // continue with byte transfer - START = 3 // start condition with byte transfer -}; - -static inline enum i2c_status i2c_get_status(struct saa7134_dev *dev) -{ - enum i2c_status status; - - status = saa_readb(SAA7134_I2C_ATTR_STATUS) & 0x0f; - d2printk(KERN_DEBUG "%s: i2c stat <= %s\n",dev->name, - str_i2c_status[status]); - return status; -} - -static inline void i2c_set_status(struct saa7134_dev *dev, - enum i2c_status status) -{ - d2printk(KERN_DEBUG "%s: i2c stat => %s\n",dev->name, - str_i2c_status[status]); - saa_andorb(SAA7134_I2C_ATTR_STATUS,0x0f,status); -} - -static inline void i2c_set_attr(struct saa7134_dev *dev, enum i2c_attr attr) -{ - d2printk(KERN_DEBUG "%s: i2c attr => %s\n",dev->name, - str_i2c_attr[attr]); - saa_andorb(SAA7134_I2C_ATTR_STATUS,0xc0,attr << 6); -} - -static inline int i2c_is_error(enum i2c_status status) -{ - switch (status) { - case NO_DEVICE: - case NO_ACKN: - case BUS_ERR: - case ARB_LOST: - case SEQ_ERR: - case ST_ERR: - return true; - default: - return false; - } -} - -static inline int i2c_is_idle(enum i2c_status status) -{ - switch (status) { - case IDLE: - case DONE_STOP: - return true; - default: - return false; - } -} - -static inline int i2c_is_busy(enum i2c_status status) -{ - switch (status) { - case BUSY: - case TO_SCL: - case TO_ARB: - return true; - default: - return false; - } -} - -static int i2c_is_busy_wait(struct saa7134_dev *dev) -{ - enum i2c_status status; - int count; - - for (count = 0; count < I2C_WAIT_RETRY; count++) { - status = i2c_get_status(dev); - if (!i2c_is_busy(status)) - break; - saa_wait(I2C_WAIT_DELAY); - } - if (I2C_WAIT_RETRY == count) - return false; - return true; -} - -static int i2c_reset(struct saa7134_dev *dev) -{ - enum i2c_status status; - int count; - - d2printk(KERN_DEBUG "%s: i2c reset\n",dev->name); - status = i2c_get_status(dev); - if (!i2c_is_error(status)) - return true; - i2c_set_status(dev,status); - - for (count = 0; count < I2C_WAIT_RETRY; count++) { - status = i2c_get_status(dev); - if (!i2c_is_error(status)) - break; - udelay(I2C_WAIT_DELAY); - } - if (I2C_WAIT_RETRY == count) - return false; - - if (!i2c_is_idle(status)) - return false; - - i2c_set_attr(dev,NOP); - return true; -} - -static inline int i2c_send_byte(struct saa7134_dev *dev, - enum i2c_attr attr, - unsigned char data) -{ - enum i2c_status status; - __u32 dword; - - /* have to write both attr + data in one 32bit word */ - dword = saa_readl(SAA7134_I2C_ATTR_STATUS >> 2); - dword &= 0x0f; - dword |= (attr << 6); - dword |= ((__u32)data << 8); - dword |= 0x00 << 16; /* 100 kHz */ -// dword |= 0x40 << 16; /* 400 kHz */ - dword |= 0xf0 << 24; - saa_writel(SAA7134_I2C_ATTR_STATUS >> 2, dword); - d2printk(KERN_DEBUG "%s: i2c data => 0x%x\n",dev->name,data); - - if (!i2c_is_busy_wait(dev)) - return -EIO; - status = i2c_get_status(dev); - if (i2c_is_error(status)) - return -EIO; - return 0; -} - -static inline int i2c_recv_byte(struct saa7134_dev *dev) -{ - enum i2c_status status; - unsigned char data; - - i2c_set_attr(dev,CONTINUE); - if (!i2c_is_busy_wait(dev)) - return -EIO; - status = i2c_get_status(dev); - if (i2c_is_error(status)) - return -EIO; - data = saa_readb(SAA7134_I2C_DATA); - d2printk(KERN_DEBUG "%s: i2c data <= 0x%x\n",dev->name,data); - return data; -} - -static int saa7134_i2c_xfer(struct i2c_adapter *i2c_adap, - struct i2c_msg *msgs, int num) -{ - struct saa7134_dev *dev = i2c_adap->algo_data; - enum i2c_status status; - unsigned char data; - int addr,rc,i,byte; - - status = i2c_get_status(dev); - if (!i2c_is_idle(status)) - if (!i2c_reset(dev)) - return -EIO; - - d2printk("start xfer\n"); - d1printk(KERN_DEBUG "%s: i2c xfer:",dev->name); - for (i = 0; i < num; i++) { - if (!(msgs[i].flags & I2C_M_NOSTART) || 0 == i) { - /* send address */ - d2printk("send address\n"); - addr = msgs[i].addr << 1; - if (msgs[i].flags & I2C_M_RD) - addr |= 1; - if (i > 0 && msgs[i].flags & - I2C_M_RD && msgs[i].addr != 0x40 && - msgs[i].addr != 0x19) { - /* workaround for a saa7134 i2c bug - * needed to talk to the mt352 demux - * thanks to pinnacle for the hint */ - int quirk = 0xfe; - d1printk(" [%02x quirk]",quirk); - i2c_send_byte(dev,START,quirk); - i2c_recv_byte(dev); - } - d1printk(" < %02x", addr); - rc = i2c_send_byte(dev,START,addr); - if (rc < 0) - goto err; - } - if (msgs[i].flags & I2C_M_RD) { - /* read bytes */ - d2printk("read bytes\n"); - for (byte = 0; byte < msgs[i].len; byte++) { - d1printk(" ="); - rc = i2c_recv_byte(dev); - if (rc < 0) - goto err; - d1printk("%02x", rc); - msgs[i].buf[byte] = rc; - } - /* discard mysterious extra byte when reading - from Samsung S5H1411. i2c bus gets error - if we do not. */ - if (0x19 == msgs[i].addr) { - d1printk(" ?"); - rc = i2c_recv_byte(dev); - if (rc < 0) - goto err; - d1printk("%02x", rc); - } - } else { - /* write bytes */ - d2printk("write bytes\n"); - for (byte = 0; byte < msgs[i].len; byte++) { - data = msgs[i].buf[byte]; - d1printk(" %02x", data); - rc = i2c_send_byte(dev,CONTINUE,data); - if (rc < 0) - goto err; - } - } - } - d2printk("xfer done\n"); - d1printk(" >"); - i2c_set_attr(dev,STOP); - rc = -EIO; - if (!i2c_is_busy_wait(dev)) - goto err; - status = i2c_get_status(dev); - if (i2c_is_error(status)) - goto err; - /* ensure that the bus is idle for at least one bit slot */ - msleep(1); - - d1printk("\n"); - return num; - err: - if (1 == i2c_debug) { - status = i2c_get_status(dev); - printk(" ERROR: %s\n",str_i2c_status[status]); - } - return rc; -} - -/* ----------------------------------------------------------- */ - -static u32 functionality(struct i2c_adapter *adap) -{ - return I2C_FUNC_SMBUS_EMUL; -} - -static struct i2c_algorithm saa7134_algo = { - .master_xfer = saa7134_i2c_xfer, - .functionality = functionality, -}; - -static struct i2c_adapter saa7134_adap_template = { - .owner = THIS_MODULE, - .name = "saa7134", - .algo = &saa7134_algo, -}; - -static struct i2c_client saa7134_client_template = { - .name = "saa7134 internal", -}; - -/* ----------------------------------------------------------- */ - -static int -saa7134_i2c_eeprom(struct saa7134_dev *dev, unsigned char *eedata, int len) -{ - unsigned char buf; - int i,err; - - dev->i2c_client.addr = 0xa0 >> 1; - buf = 0; - if (1 != (err = i2c_master_send(&dev->i2c_client,&buf,1))) { - printk(KERN_INFO "%s: Huh, no eeprom present (err=%d)?\n", - dev->name,err); - return -1; - } - if (len != (err = i2c_master_recv(&dev->i2c_client,eedata,len))) { - printk(KERN_WARNING "%s: i2c eeprom read error (err=%d)\n", - dev->name,err); - return -1; - } - for (i = 0; i < len; i++) { - if (0 == (i % 16)) - printk(KERN_INFO "%s: i2c eeprom %02x:",dev->name,i); - printk(" %02x",eedata[i]); - if (15 == (i % 16)) - printk("\n"); - } - return 0; -} - -static char *i2c_devs[128] = { - [ 0x20 ] = "mpeg encoder (saa6752hs)", - [ 0xa0 >> 1 ] = "eeprom", - [ 0xc0 >> 1 ] = "tuner (analog)", - [ 0x86 >> 1 ] = "tda9887", - [ 0x5a >> 1 ] = "remote control", -}; - -static void do_i2c_scan(char *name, struct i2c_client *c) -{ - unsigned char buf; - int i,rc; - - for (i = 0; i < ARRAY_SIZE(i2c_devs); i++) { - c->addr = i; - rc = i2c_master_recv(c,&buf,0); - if (rc < 0) - continue; - printk("%s: i2c scan: found device @ 0x%x [%s]\n", - name, i << 1, i2c_devs[i] ? i2c_devs[i] : "???"); - } -} - -int saa7134_i2c_register(struct saa7134_dev *dev) -{ - dev->i2c_adap = saa7134_adap_template; - dev->i2c_adap.dev.parent = &dev->pci->dev; - strcpy(dev->i2c_adap.name,dev->name); - dev->i2c_adap.algo_data = dev; - i2c_set_adapdata(&dev->i2c_adap, &dev->v4l2_dev); - i2c_add_adapter(&dev->i2c_adap); - - dev->i2c_client = saa7134_client_template; - dev->i2c_client.adapter = &dev->i2c_adap; - - saa7134_i2c_eeprom(dev,dev->eedata,sizeof(dev->eedata)); - if (i2c_scan) - do_i2c_scan(dev->name,&dev->i2c_client); - - /* Instantiate the IR receiver device, if present */ - saa7134_probe_i2c_ir(dev); - return 0; -} - -int saa7134_i2c_unregister(struct saa7134_dev *dev) -{ - i2c_del_adapter(&dev->i2c_adap); - return 0; -} - -/* ----------------------------------------------------------- */ -/* - * Local variables: - * c-basic-offset: 8 - * End: - */ |